Fedora 23: KDE vs. Xfce vs. GNOME vs. LXDE vs. MATE
When running Xonotic with high image quality settings, KDE and Xfce were running slower than GNOME, LXDE, and MATE.
When increasing the GPU workload for Xonotic, the performance difference between Xfce and GNOME/LXDE/MATE tightened while KDE was still slower than the other desktops. Again, this is just some weekend tests of Fedora 23 with the available desktops as setup by default on this Linux distribution that should be officially released in early November.
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